Question:

Azotobacter and Bacillus polymyxa are the examples of

Updated On: Jun 27, 2024
  • pathogenic bacteria
  • decomposers
  • symbiotic N2 fixer
  • non-symbiotic N2 fixer.
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The Correct Option is D

Solution and Explanation

Symbiosis is a mutually beneficial relationship or interaction between individuals of two different species with none of the two capable of living separately, e.g., Rhizobium is associated with root nodules of legumes. It fixes nitrogen for the plant and the plant provides it food and shelter. Azotobacter is a free-living bacteria which occurs in the soil and fixes nitrogen directly. Bacillus is also a free living bacteria which acts upon nitrogenous excretions and proteins of dead bodies of living organisms. These are therefore, non-symbiotic N2 fixing bacteria.
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Biological Classification

The process of grouping living organisms into categories is called biological classification. The most modern 5-kingdom classification was put ahead by an eminent scientist R.H.Whittaker. The five-kingdom classification is based on the criteria like cell structure, mode of nutrition, body form, and reproduction. One of the most important characteristics of this system is that it follows the evolutionary sequence of living organisms. The organisms are classified into distinct taxa or levels like Kingdom, Phylum, Division, Class, Order, Family, Genus, and Species. The 5 kingdoms are as follows:

Biological Classification